DK173955B1 - Liquid herbicide concentrate and its use in a method for controlling undesirable vegetation - Google Patents

Abstract

A liquid phytoactive composition characterised in that it comprises; (a) an N-phosphonomethyl-N-carboxymethyl compound; (b) one or more liquid nonionic surfanctants; (c) a dispersing medium for the said N-phosphonomethyl-N-carboxymethyl compound; and (d) one or more inert adjuvants is disclosed. A liquid herbicidal concentrate characterised in that it comprises: (a) an herbicidally effective N-phosphonomethyl-N-carboxymethyl compound (b) one or more liquid nonionic surfactants; (c) a solvent for the said N-phosphonomethyl-N-carboxymethyl compound; and (d) one or more inert adjuvants is also disclosed. The formulation of this invention has the advantage that it can contain a high amount of active ingredient, is thermally stable over a wide temperature range, is compatible with and dilutable in both hard and soft water, and is also compatible and dilutable with a nitrogeneous fertilizer solution, and is minimally irritable to the eyes. Also, the formulation of this invention is stable upon aging over months of storage, over a wide temperature range. In addition, the nonionic surfactants are derived from naturally occurring products and are readily broken down by microorganisms.

Description

DK 173955 B1

The present invention relates to novel liquid herbicidal concentrates which can be diluted with water or aqueous liquid prior to use in the field. The phytoactive compound in the concentrate of the invention contains the group O -c-ch2-n-ch2-pc (I).

The invention further relates to a method for controlling undesirable vegetation using the concentrate of the invention.

The phytoactive compounds containing the group listed above as Formula I are referred to herein as N-phosphonomethyl-N-carboxy-methyl compounds or "PMCM" compounds. These compounds and the group of formula I will be further defined and illustrated below. For convenience, the phytoactive compounds containing the group of formula I will hereinafter be referred to as PMCM compounds.

A large number of phytoactive PMCM compounds are known in the art. The term "phytoactive" as used in the description of this invention means effective as a plant growth regulator, as a herbicide, as a detergent or the like. Illustrative of such PMCM compounds and their use are disclosed in U.S. Patents Nos. 31455,675, 3,799,758, 20 3,556,762, 4,405,531, 3,868,407, 4,140,513, 4,315,765, 4,481,026 and 4,397,676. as well as international application WO 84/03607.

Most of these patents also include descriptions of methods used to prepare such compounds. The following patents further disclose methods of U.S. Patent Nos. 3,288,846,4,507,250,4,147,719 and 4,487,724.

Certain PMCM compounds, salts of N-phosphomethylglycine, have been found to be particularly effective as post-emergence herbicides.

Such salts of N-phosphomethylglycine which are particularly effective as herbicidal agents include the trimethylsulfonium salts of N-phosphonomethylglycine as described in U.S. Patent No. 4,315,765, the mixed alkylsulphonium salts of N-phosphonomethylglycine as described in U.S. Patent No. 4,437 .874 and the trialkyl salts of N-phosphonomethylglycine disclosed in U.S. Pat. Nos. 4,384,880 and 4,345,765.

Usually herbicidal agents are formulated as powders, granular agents, liquid emulsions or liquid concentrates. The salts of N-phosphonomethylglycine used as the active ingredients in herbicides are preferably formulated as liquid concentrates because they are actually water-soluble and hygroscopic, making it difficult to crystallize them and isolate them from water solutions. A good liquid concentrate exhibits good compatibility for the various components, good heat stability and good long-term storage stability, and miscibility of the active ingredient with the liquid solvent. In addition, it should have minimal eye irritation and low inhalation irritation levels. Not all liquid concentrates containing the salts of N-phosphonomethylglycine as active ingredient have these properties.

The prior art is considered to be described in the above-mentioned U.S. Patent No. 4,315,765 and in U.S. Patent No. 3,799,758.

US Patent No. 4,315,765 discloses various trialkylsulfonium salts of N-phosphonomethylglycine. Also described are a number of formulation types, including powders, solutions, emulsifiable concentrates and wettable powders. A list of various nonionic surfactants is provided, but there is no reference to alkyl polyglycosides as a solution to the problem of obtaining dilute clear herbicidal concentrates.

U.S. Patent No. 3,799,758 states that a number of different glyphosate formulations exist. A list of possible surfactants is listed in this patent.

However, there is no indication that would allow the skilled artisan 10 to select an alkyl polyglycoside as a solution to the problem of providing a dilute clear herbicide concentrate.

The object: therefore, of this invention is to provide a phytoactive agent in the form of a liquid concentrate, using as an active ingredient a PMCM compound, preferably an agriculturally acceptable salt of N-phosphonomethylglycine, and a nonionic surfactant. .

The present invention relates to a liquid, phytoactive formulation containing as active ingredient an N-phosphonomethyl-N-carboxymethyl compound dissolved or dispersed in a suitable medium, and a liquid, nonionic surfactant. The formulation can be diluted with water or an aqueous liquid before use in the field.

The formulation of this invention has the advantage that it can contain a large amount of active ingredient, is thermally stable over a wide temperature range, is compatible with and dilutable in both hard and soft water, and is also compatible. diluted with a nitrogenous fertilizer solution as well as minimally irritating the eyes. The formulation of this invention is also stable in aging over months of storage over a wide range of temperatures. In addition, the nonionic surfactants are derived from naturally occurring products and are readily degraded by microorganisms.

The invention therefore relates to a novel herbicidal concentrate which can be diluted with water 10 or aqueous liquid prior to use in the field, which concentrate is characterized in that it comprises: (a) a herbicidally effective N-phosphonomethyl-N-carboxymethyl compound, (b) one or more liquid, nonionic surfactants selected from alkyl polyglycosides, (c) a solvent for the N-phosphonomethyl-N-carboxymethyl compound, and (d) one or more inert auxiliaries.

The method of the invention comprises using a herbicidally effective amount of the concentrate described above at the site where control is desired. Usually this would be on the leaves of the harmful weed to be eradicated.

Any liquid dispersible, phytoactive PMCM compound can be used in the agents and methods of the invention. The term "liquid dispersible" is used in a broad sense to include precursors. B1 binders which are soluble in a liquid, as well as compounds which are merely dispersible. In preferred embodiments, the PMCM compound is liquid soluble. In the most preferred embodiment, it is water soluble.

The PMCM bleaches may be represented by the formula 0 Z 0 rc-ch 2 n-ch 2 p - (R) 2 wherein R is selected from halogen, -NHOH, -N (R 2 ") ~ f -OR 2, -SR 2 and 1 * -OM wherein R is independently selected from hydrogen, alkyl or hydroxyalkyl, preferably containing less than about 5 carbon atoms, alkenyl, preferably containing less than about 5 carbon atoms, or phenyl, R is independently selected from hydrogen, alkyl, hydroxyalkyl and chloroalkyl, preferably containing less than about 5 carbon atoms, alkoxy, preferably containing less than about 5 carbon atoms, alkyleneamine, preferably containing less than about 12 carbon atoms, phenyl or benzyl, and M is selected from hydrogen and agriculturally acceptable salt forming groups such as alkali metal, alkaline earth metal, stannic, ammonium, organic ammonium, alkylsulfonium, alkylsulfoxonium, alkylphosphonium groups or combinations thereof, and Z is hydrogen, an organic group or an inorganic group.

Representative patents describing at least some of such compounds include U.S. Patent Nos. 3,799,758, 4,397,676, 4,140,513, 4,315,765, 3,868,407,

4,405,531, 4,481,026, 4,414,158, 4,120,689, 4,472,189, 4,341,549 and 3,948,975.

Representative patents describing PMCM compounds wherein Z is different from hydrogen include U.S. Patent Nos. 3,888,915, 3,933,946, 4,062,699, 4,119,430, 4,322,239 and 4,084,954.

In preferred PMCM compounds, Z is hydrogen or an organic substituent. Representative organic substituents include methylene carboxyl, methylene phosphone, methylene cyano, carbonyl, such as formyl, acetyl, benzoyl, perfluoroacyl and thiocarbonyl, ethylene such as cyano, carbamoyl or carboxy substituted ethyl and benzenesulfonylsubstituted. Representative patents describing compounds wherein the nitrogen atom contains three organic substituents include U.S. Patent Nos. 3,455,675, 3,556,762, 3,853,530, 3,970,695, 3,988,142, -3,991,095, 3,996,040. , 4,047,927, 4,180,394, 4,203,756, 4,216,727 and 4,312,662. A preferred tertiary, nitrogen-substituted PMCM compound is N, N-bis (phosphonomethyl) glycine.

The PMCM compounds wherein Z is hydrogen are most preferred when the desired phytoactivity is herbicidal activity.

15

Illustrative, agriculturally acceptable salt-forming groups represented by M, such as in OM, are the alkali metals with atomic weights from 22 to 133 inclusive, such as sodium, potassium or rubidium, the alkaline earth metals with atomic weights from 24 to 88 inclusive, such as magnesium or calcium, ammonium and aliphatic ammonium, wherein the aliphatic ammonium is primary, secondary, tertiary or quaternary, and preferably wherein the total number of carbon atoms does not exceed more than ca. 12, phenylammonium, trialkylsulfonium, preferably wherein the total number of carbon atoms in the three alkyl substituents does not exceed more than ca. 6, such as trimethylsulfonium, ethyldimethylsulfonium, propyl-dimethylsulfonium and the like, trialkylsulfoxonium, preferably wherein the total number of carbon atoms in the three alkyl substituents does not exceed about 6 such as trimethylsulfoxonium, ethyldimethylsulfoxonium, propyldimethylsulfoxonium and the like, tetraalkylphosphonium such as tetramethylphosphonium, ethyl trimethylphosphonium, propyltrimethylphosphonium and the like.

It should be noted that the alkaline earth metal salts only provide inferior herbicidal activity, although they are agriculturally acceptable.

In preferred agents of this invention, M is independently selected from the agricultural described salt-forming groups and hydrogen described above. In more preferred agents, M is an alkali metal, ammonium, monoalkylammonium or trialkylsulfonium.

In the most preferred agents, only one M is an alkali metal, ammonium, monoalkylammonium or trialkylsulfonium, while the other two M's are hydrogen. Representative, most preferred agents include isopropylamine-N-phosphonomethylglycine, trimethylsulfonium-N-phosphonomethylglycine, and sodium sesqui-N-phosphonomethylglycine. Combinations of two or more PMCM compounds can be used in the agents and methods of the invention.

The liquid, nonionic surfactants used as one of the essential components of the herbicidal compositions of the invention can be e.g. be any of the following 20 specific compounds AL-1685 and AL-2042 sold by ICI, Emcol D-7533 and Witcamide 272 (a modified alkanol amide) sold by Witco Chemical Company, Staley APG 91- 3

Staley APG 91-1, Staley APG 23-1 and Staley APG 23-3, all alkyl polyglycosides sold by Staley Corporation, and Crodesta 25 SL-40, a monococoat sold by Croda Inc. A typical surfactant APG agent has the repetitive structural formula

CH 2 OH CH 2 OB

Q_. ISLAND

db T - ^ - a-1 T-yjjcBjjrfHa 8 DK 173955 B1

Any of two (or more) of the aforementioned nonionic surfactants can be mixed in different ratios and used in the herbicidal agent to achieve better physical surfactant properties than when each is used alone. An example is the combination of AL-1685 and APG 91-3 at a ratio of 60:40 or 70:30.

In addition to the foregoing, inert auxiliaries may also be incorporated into the agents of this invention to provide a more satisfactory formulation. Such inert auxiliaries include antifoam agents, preferably dimethylpolysiloxane, pyrogenic silica as a thickening agent and optionally water.

The weight percent of the active PMCM compound in the liquid concentrates of this invention can range from about 10 to approx. About 70% by weight, preferably from ca. 30 to approx. 40% by weight and most preferred from approx. 38 to approx. 42% by weight.

The nonionic surfactants used in the compositions of this invention can range from approx. 5 to approx. 40% by weight, preferably from approx. 15 to approx. 30% by weight and most preferably from about 20%. 15 to approx. 25% by weight.

The amount of inert auxiliary used in the agents of this invention may vary from ca. 0.5 to approx. 10% by weight, preferably from approx. 1 to approx. 5% by weight and most preferably from approx.

1 to approx. 3% by weight.

25 Water or other liquid medium constitutes the remainder of the liquid concentrate. It can vary from approx. 10 to approx. 70% by weight, preferably from ca. 20 to approx. 50% by weight.

9 DK 173955 B1

The phytoactive agents of the invention can be prepared by preparing a solution of the active PMCM compound and adding thereto the nonionic surfactant, any additives, and as much additional dispersant as required. The preferred dispersant is water.

The advantages of using nonionic surfactant in the process and agents of this invention are that they are generally inexpensive, readily available, poor or non-irritating, often with low toxicity to mammals, and are generally low or non-foaming. , and because they are derived from naturally produced products, they are easily degraded by microorganisms.

As previously indicated, mixtures of various nonionic surfactants may also be used if desired.

The preferred phytoactive agents of this invention have a herbicidal active ingredient.

Following are examples of various formulations of the herbicidal agents of this invention.

Component Weight% (a.b. **) 1. X-100 * (72%) 57.2 (41.2) 20 AL-2042 (100%) 10.3 (10.3)

Staley APG 91-3 (57%) 18.1 (10.3)

Water 14.4 100.0%

SS'jSSSSSS

DK 173955 B1

Ingredient Weight% 10.

x-100 (56%) 73.3 (41.2) AL-2042 (100%) 20.6

Water 6.1 100.0% 5 3. X-100 (72%) 57.2 (41.2)

Staley APG 91-3 (57%) 36.1 (20.6)

Water 6.7 100.0% 4. X-100 (72%) 57.2 (41.2) AL-1685 (100%) 10.3 (10.3) Staley APG 91-3 (57%) 18.1 (10.3)

Water 14.4 100.0%

BBBSBS

5. X-100 (57%) 51.8 (29.5)

Staley APG 91-3 (70%) 48.2 (33.9) 100.0% 6. X-100 (57%) 53.0 (30.2) Staley APG 91-3 (57%) 47, 0 (26.8) 100.0% 7. X-100 (57.3%) 71.9 (41.2)

Spray-dried Staley 23-3 (100%) 20.6

Water '7.5 100.0% sssrss

Component Weight% 11 DK 173955 B1 (a.b.XX) 8. X-100 (72%) 57.2 (41r2)

Staley APG 23-1 (53%) 38.9 (20.6)

Water 3.9 100.0% 5 9. X-100 (72%) 57.2 (41.2)

Staley APG 23-3 (46%) 42.8 (19.7) 100.0% 10. X-100 (72%) 57.2 (41.2)

Staley APG 91-1 (51%) 40.4 (20.6)

Water 2.4 100.0% 10 11. X-100 (72%) 57.2 (41.2)

Staley APG 91-3 (57%) 36.1 (20.6)

Water 6.7 100.0%

B33C5B

12. X-100 (57%) 71.9 (41.2) AL-2042 (100%) 20.6 15 Water 7.5 100.0% 13. X-100 (57%) 54.3 (31 , 2) AL-2042 (100%) 31.2

Water 14.5 '100.0% ssssss DK 173955 B1 12

Ingredient Weight% / U XX \ (a.b.) 14. X-100 (57%) 66.4 (38.2)

Emcol D-7533 (Witco) 19/1

Water 14.5 100.0% 5 15.X-100 (57%) 54.3 (31.2)

Emcol D-7533 (Witco) 31.2

Valid 14.5 100.0% 16. X-100 (57%) 54.3 (31.2) AL-2041 31.2 10 Water 14.5 100.0% 17. X-100 (57%) 63 , 2 (36.3) AL-2042 27.3

Water 9.5 100.0% ssssess 18. X-100 (57%) 71.9 (41.2) AL-1685 20.6

Water 7.5 100.0% 19. X-100 (57%) 71.9 (41.2)

Staley APG 91-3 20.6

Water - 7.5 .100.0% DK 173955 B1 13

Component Weight% (a.xx.) 20. X-100 (57%) 71.9 (41.2) AL-2041 20.6

Water 7.5 100.0%

SSSSSB

21. X-100 (57%) 71.9 (41.2)

Emcol D-7533 20.6

Water 7.5 100.0% 22. X-100 (57%) 71.9 (41.2)

Emcol D-7533 20.6 10 Water 7.5 100.0% 23. X-100 (57.5%) 71.7 (41.2)

Staley APG 23-3 20.6

Water 7.7 100.0% ssacsa 24. X-100 (57%) 71.9 AL-1685 (ICI) 20.6

Water 7.5 100.0% 25. X-100 (57.5%) 71.7 (41.2)

Staley APG 91-1 20.6

Water 7.7 100.0%

Component Weight% DK 173955 B1 14 (a.b. **) 26. X-100 (57.5%) 71.7 (41.2)

Staley APG 91-3 20.6

Water 7.7 100.0% r ===== s = 5 27. X-100 (57.5%) 71.7 (41.2)

Staley APG 23-1 20.6

Water 7.7 100.0% cesses x X-100 = the trimethylsulfonium salt of N-phosphonomethylglycine in aqueous solution.

XX

10 a.b. refers to active ingredient.

In addition to the PMCM compound and the surfactant, the agent may also comprise other conventional adjuvants such as heat stabilizers, ultraviolet light absorbers, dispersants, and other agriculturally acceptable materials. Representative heat stabilizers include phenylene diamines, phenazine and butylated hydroxytoluene. Representative agents that absorb ultraviolet light include Tinuvin 770, Ti, nuvin p and dinitroanilines.

The ratio of PMCM compound to surfactant may vary over a wide range. Since it is known that the choice of a particular surfactant can affect the phytoactivity of the PMCM compounds used in accordance with this invention, the desired activity of the liquid agent should be taken into account when selecting a particular surfactant. agent. As much surfactant can be used as desired, as long as the products dissolve completely or are easily dispersed in the diluent before use. For the sake of cost, the minimum amount of surfactant should still be used which still enables the objects of the invention to be achieved. The ratio of PMCM compound to surfactant is typically on a weight basis ranging from approx. 10: 1 to approx. 1:10. The preferred ratio is from approx. 4: 1 to approx. 1: 2. The most preferred ratio is from approx. 2: 1 to approx. 1: 1.

The agents of this invention can be prepared in any suitable manner. However, a preferred method involves first preparing a mixture containing the PMCM compound and the dispersant. In preferred embodiments, the PMCM compound is dissolved in the agent. In other embodiments, the PMCM compound is dispersed therein.

In some embodiments, the mixture is prepared by forming the PMCM compound in situ. For example, in some embodiments, N-phosphono-methylglycine is reacted with a desired base in the presence of water to form an aqueous solution containing the PMCM compound. In preferred embodiments, solutions 20 of isopropylamine-N-phosphonomethylglycine can be prepared in this way.

The dispersant to be used in accordance with the method of this invention must meet certain requirements.

The agent must be capable of dissolving or dispersing a desired PMCM compound at the temperature used to form the original mixture, without adversely affecting the phytoactivity of the PMCM compound. The greater the solubility or ease or dispersibility of the PMCM compound in the dispersing eye, the less agent will be required and the subsequent removal of the agent will be facilitated.

Preferred dispersing agents include water and polar organic solvents such as methanol, ethanol, isopropyl alcohol and acetone. Water is the most preferred.

16 DK 173955 B1

The herbicidal agents provided in accordance with this invention are effective when diluted with water and applied to the desired site by spraying or otherwise. The site of application may be soil, seeds, seedlings or the actual plants as well as fenced red fields. Preference is given to the leaves. The agents can be applied by the use of boom and head sprayers and can also be applied by spraying from airplanes because they are effective at very low doses.

Herbicide studies:

As previously mentioned, the PMCM compounds described herein are phytotoxic compounds that are useful and valuable for regulating various plant species. Selected compounds of this invention were tested as herbicides in the following manner;

Post-emergence herbicide test: On the tenth day before treatment, seeds of different weed species were planted in clay sandy soil in individual rows using one species per day. row in the width of a plant box. Seeds used were Johnson grass (Echinochloa crusgalli), one-year-old king for a day (Ipomoea lacunosa), velvet leaf (Abutilon theo-phrasti), Bermuda grass (Cynodon dactylon), yellow nut star (Cyperus esculentus) and violet nut desert. Oer was planted 25 copious amounts of seeds to yield approx. 20 - 40 seedlings per row by emergence, depending on the size of the plants.

A series of formulations were prepared by combining the tri-methylsulfonium salt of N-phosphomethylglycine (TMP) with various surfactants and water. In formulation # 1 in the following table, the term "TMP 4-LC (B)" refers to a formulation comprising 73.7% by weight of an aqueous solution 5 of the trimethylsulfonium salt of N-phosphonomethylglycine (55.9% active ingredient), 20.6% by weight of a surfactant and 5.7% by weight water. In each of the other formulations listed below, numerical correlation has been made between the formulation and the formulations in the table. In the formulations indicated, the active ingredient (TMP) is indicated and the percentage of active ingredient in the solution is indicated next to it. The surfactant is also indicated as having a specific percent purity, which is indicated next to the chemical name of the active agent.

In the test procedure, each individual formulation was dissolved in water and different portions of water were used to dilute the concentration of the formulation to obtain the desired amount of application.

After the desired dilution was achieved, the solution was then sprayed onto a sown plant box on a linear syringe band, calibrated to yield 748 liters per liter. acres.

After treatment, the plant boxes were placed in a greenhouse at a temperature of 21 - 27 ° C and irrigated by showering. Two weeks after treatment, the degree of damage or regulation was determined by comparison with untreated control plants of the same age.

25 The damage rating from 0 to 100% for each species was recorded as percent regulation, with 0% indicating no damage and 100% indicating complete regulation.

The results of the experiments are shown in the following tables.

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_. annual

Formal Quantity, Yellow King for

Formulation (please) iag / mr Velvet leaf nutstars one day 1. IMP 57.3% 71.9 (41.2) 56 40 40 40 272 20'6 112 70 70 100

Water 7.5 224 95 90 100 100.0% 5 2. TMP 57.3% 71.9 (41.2) 56 30 30 30 ^ J ^ 7513 20.6 112 60 60 70

Water 7.5 224 95 90 95 100.0% 3. TMP 57.3% 71.9 (41.2) 56 40 40 40 1 ° anole ^ D-7533 20.6 112 70 70 ioo

Water 7.5 224 98 95 100 100.0% 4. TMP 57.5%. 71.7 (41.2) 56 40 50 30 APG 23-3 100% 20.6 (9.5) 112 60 90 50 15 Water 7.7 224 90 100 80 100.0% 5. TMP 57.5% 71.7 (41.2) 56 30 40 30 APG 91-1 51% 20.6 (10.5) 112 60 70 50

Water 7.7 224 90 100 80 100.0% 6. TMP 57.5% 71.7 (41.2) 56 40 50 30 20 APG 91-3 57% 20.6 (11.7) 112 80 90 50

Water 7.7 224 100 100 80 100'0% (cont.) 25 DK 173955 B1

One Year Quantity, Yellow King for

Formulation mg / ir / Velvet leaf nutstars one day

Control 0 0 0 0

Control 0 0 0 0 a.b. = active ingredient.

The amount of the present agent which constitutes a herbicidally effective amount depends upon the nature of the seeds or plants to be regulated. The amount of application varies from approx. 1.1 mg / m to 2 2 approx. 5.6 g / m (a.b.), preferably from ca. 11 mg / m to approx. 2.8 g / m (a.b.), the actual amount being dependent on the total cost and results desired. It will be readily apparent to those skilled in the art that agents exhibiting a local herbicide activity will require a higher dose than more active compounds of the same degree of regulation.

As used herein, the term "herbicide" refers to a compound that regulates or modifies plant growth, e.g. killing, delaying, draining, desiccating, regulating, crippling, sentence 15 of shoot from the stem and dwarf growth. "Plant" refers to all physical parts, including seeds, seedlings, young trees, roots, tubers, stems, stems, leaves and fruits. "Plant growth" shall include all stages of development from seed germination to natural or induced cessation of life.

Claims (7)

A liquid herbicide concentrate which can be diluted with water or aqueous liquid prior to use in the field, characterized in that it comprises (a) a herbicide-efficient N-phosphonomethyl-N-carboxymethyl compound, (b) one or more liquid, -ionic surfactants selected from alkyl polyglycosides, (c) a solvent for the N-phosphonomethyl-N-carboxymethyl compound, and (d) one or more inert adjuvants. Concentrate according to claim 1, characterized in that the percentage weight percent of the N-phosphonomethyl-N-carboxymethyl compound (a) is from 10 to 70% by weight. Concentrate according to claim 1 or 2, characterized in that the percentage by weight of the liquid, nonionic surfactant (b) is from 5 to 40% by weight. Concentrate according to any one of claims 1-3, characterized in that (a) 15 is the trimethylsulfonium salt of N-phosphonomethylglycine. Concentrate according to any one of claims 1-4, characterized in that (d) contains one or more substances selected from an anti-foaming agent, a heat stabilizing agent and an ultraviolet light absorbing agent. Concentrate according to any one of claims 1-5, characterized in that (a) 20 is present in an amount of approx. 10 to approx. (B) is present in an amount of about 50% by weight; 15 DK 173955 B1 to approx. (C) is present in an amount of about 30%. 20 to approx. And (d) is present in an amount in the range of about 50%. 1 to approx. 5%. A method for controlling undesirable vegetation, characterized in that it comprises the use of a herbicidally effective amount of a concentrate according to any one of claims 1 to 6 at a site where said control is required.